then reduces the amount of oxygen that is in the air around the fire and then smothers it‚ which is helping extinguish the fire (University of Massachusetts Boston). The agent‚ sodium chloride‚ also has the same kind of effect. The heat of the fire tends to cause the dry powder‚ in which this case is sodium chloride‚ to cake and form an exterior crust. This crust then excludes air‚ which ends up in resulting in extinguishment. It also tends to dissipate the heat from the burning metal (University
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EDTA. METHOD The following apparatus was collected: 50cmᶟ burette ●Glass stirring rod 20cmᶟ pipette ●Hydrated nickel(II) sulphate (NiSO₄.6H₂O) 100cmᶟ standard flask ●Standardised 0.10moll⁻¹ EDTA solution 250cmᶟ conical flask ●1 moll⁻¹ ammonium chloride Weighing bottle ●Murexide indicator Balance (accurate to 0.01g) ●0.88 aqueous ammonia 100cmᶟ beakers ●Deionised water 25cmᶟ measuring cylinder Wash bottle Pipette filler White tile Filter funnel Approximately 2.6g of hydrated nickel(II)
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important compounds for living things. In the water molecule (H2O)‚ the hydrogen and oxygen atoms bond so that the electrical charge is unevenly distributed. The area of the molecule containing oxygen has a slightly negative charge‚ and the areas containing hydrogen have slightly positive charges. Polar Compound: a compound with one side having a negative charge and the other side a positive charge Hydrogen bonds form between water molecules. • Six Unique Properties of Water 1.
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Group A: Model Answer GROUP A MODEL ANSWER Yoshida et al.‚ Flexibility of Hydrogen Bond and Lowering of Symmetry in Proton Conductor‚ Symmetry 2012‚ 4‚ 507-516. DO NOT PLAGIARISE THIS MODEL ANSWER PLAGIARISM FROM ANY SOURCE AUTOMATICALLY LEADS TO A ZERO SCORE Paragraph 1 There are three phases whereby each has a different crystal structure at three different temperatures. At room temperature (298K)‚ Phase III is present whereby Cs3H(SeO4)2 has a crystal structure of a monoclinic
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Grades K-5 Pencil Electrolysis Introduction: The process by which we separate the elements hydrogen and oxygen from water is called electrolysis. The word "lysis" means to dissolve or break apart‚ so the word "electrolysis" literally means to break something apart (in this case water) using electricity. It is difficult to break up water into it’s elements lots of energy is needed to do that. Through a chemical means though‚ we can separate the compound of water into the elements that combine to
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simplest example of an atom with different isotopes is hydrogen. The three isotopes of hydrogen are shown here: The increasing number of neutrons in the nucleus of the hydrogen atom adds mass to the atom and thus each isotope of a given element has a different mass. Isotopes can be represented as follows: For the isotopes of hydrogen‚ 1H (or hydrogen-1)‚ 2H (or hydrogen-2) and 3H (or hydrogen-3) represent protium (usually just referred to as hydrogen)‚ deuterium and tritium‚ respectively. Most of
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Bonds is something that retains and holds on together with one another. There are three major chemical bonds and they are‚ Ionic‚ Covalent‚ and Hydrogen bonds. An example of a covalent bond would be SCl^2 which is Sulfur dichloride. SCl^2 is a covalent bond because since they are close to each other in valence electrons‚ they have almost full outer shells so they share electrons with one another. A good example is table salt NaCl‚ because they are on opposite sides of the periodic table therefore
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protons. it shares hydrogen atoms. it gains or loses neutrons. Question 7 of 20 The symbol 3CO2 represents one atom of oxygen and three atoms of carbon. three atoms of carbon and one molecule of oxygen. three molecules of carbon dioxide. one atom of carbon and three atoms of oxygen. Question 8 of 20 In water‚ hydrogen bonding occurs between the hydrogen and an oxygen atom in the same molecule. an oxygen atom in a different molecule. a hydrogen atom in a different
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polarity of water molecules results in hydrogen bonding. A hydrogen bond forms when the oxygen of one water molecule is electrically attracted to the hydrogen of a close molecule. Hydrogen bonding between water molecules is the basis for water’s unusual properties. Organisms depend on the cohesion of water molecules. Hydrogen bonding makes water molecules stick to each other‚ and this cohesion helps pull water upward in the microscopic vessels of plants. Hydrogen bonding is also responsible for water’s
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moles of carbon dioxide are produced when 10.0 moles of propane are burned in excess oxygen on a gas grill? C3H8 + 5O2 → 3CO2 + 4H2O 4. mole-mass problem: Water decomposes to produce hydrogen gas and oxygen gas. How many grams of water would be required to produce 10.0 moles of hydrogen gas? 2H2O → 2H2 + O2 MMH2O = 18.015 g/mol 5. mass-mole problem: If 25.0 grams of carbon dioxide are used in photosynthesis how many moles of glucose (C6H12O6) could be Produced according
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